402031101440 has 160 divisors (see below), whose sum is σ = 1039897504800. Its totient is φ = 148496318464.

The previous prime is 402031101413. The next prime is 402031101449. The reversal of 402031101440 is 44101130204.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402031101449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2219411 + ... + 2393709.

It is an arithmetic number, because the mean of its divisors is an integer number (6499359405).

Almost surely, 2^402031101440 is an apocalyptic number.

402031101440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402031101440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519948752400).

402031101440 is an abundant number, since it is smaller than the sum of its proper divisors (637866403360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402031101440 is a wasteful number, since it uses less digits than its factorization.

402031101440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174392 (or 174376 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 402031101440 its reverse (44101130204), we get a palindrome (446132231644).

The spelling of 402031101440 in words is "four hundred two billion, thirty-one million, one hundred one thousand, four hundred forty".